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n in (-oo:+oo)
(n/21)/5 = 2/6 // - 2/6
(n/21)/5-(2/6) = 0
(n/21)/5-1/3 = 0
1/105*n-1/3 = 0 // + 1/3
1/105*n = 1/3 // : 1/105
n = 1/3/1/105
n = 35
n = 35
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